What is characterized as an asphalt treated permeable base?

The correct answer refers to the concept of an asphalt treated permeable base, which is fundamentally based on a specific application of asphalt and aggregate. An asphalt treated permeable base is essentially a mixture that allows for water drainage while providing necessary structural support.

In this context, the choice that aligns best with the characteristics of an asphalt treated permeable base involves a composite structure where a layer of asphalt is specifically designed to allow water to permeate through it. This treatment generally ensures increased durability and better performance by maintaining acceptable drainage characteristics.

The other choices do not fit this definition. Concrete placed on aggregate or over asphalt lacks the distinct mix of asphalt and aggregate that characterizes the permeable base. Additionally, asphalt placed on soil does not provide the engineered combination needed for permeability and structural integrity that asphalt treated permeable bases are known for. Thus, the identified answer is the most appropriate characterization of an asphalt treated permeable base in the realm of paving technology.